Gas-pump for refrigerating and ice machines



(No Model.) I

. vW, H. WOOD 8; G. RICHMOND.

GAS'PUMP FOR REFRIGERATING'AND ICE MACHINES.

N o.268,-348 Patented Nov. 28, 1882.

WITNESSES: INVENTORS N, PETERS. Photn-Lflhogmphar, Walhinglon. 0.6.

UNITED STATES PATENT O FICE.

WILLIAM H. WOOD AND GEORGE RICHMOND, OF BROOKLYN, NEW YORK.

GAS-PUMP FOR REFRlGERATlNG AND ICE MACHINES.

SPECIFICATION forming part of Letters Patent No. 268,348, dated November28, 1882. -Application filed September 5, 1882. (No model.)

To all whom it may concern Be it known thatwe, WILLIAM H. Wool) andGEORGE RICHMOND, of Brooklyn, in the county of Kings and State of NewYork, have invented certain new and useful Improvements in Gas-Pumps forRefrigerating and Ice Machines; and we do hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,which form a part of this specification.

Our invention has relation to the gas-pumps of refrigerating and icemachines-that is to say, the pumps by which the volatilized ammonia,ether, or benzole (as the case may be) is forced into the condensingapparatus, there to be again liquefied in the manner and for a purposewell understood to those familiar with this class of machines. Incompressinga liquefiable gas (such as ammonia-gas) considerable heat isgenerated, the temperature rapidly rising and seriously affecting thepacking and other vulnerable parts of the apparatus, besides causingundue expansion of the metallic parts, by which leakage is apt to occur,and which is also apt to affect the smooth and gastight working of thepump piston or follower within its appropriate cylinder.

In an application of even date herewith for Letters Patent forimprovements in refrigerating and ice machines invented by us we havetreated this subject fully, and described various means for cooling thepump-cylinders below a point or degree where deleterious results wouldensue fromthe heat generated by the compression of the gases; and it isthe object of this present application to claim one of the alternativeconstructions and arrangements of parts as therein shown-to wit, theinjecting of liquid (of the same kind as that which is being compressed)into the cylinder of the pump in which the compression is effected.

In the accompanying drawings, Figure 1 represents a vertical sectionalview of one of our improved pnmp-cylinders with the injecting apparatus.Fig. 2 is a sectional view, on an enlarged scale, of the injectingapparatus, and

Fig. 3 is a sectional view illustrating a modified arrangement of theinjecting apparatus.

Similar letters of reference indicate corresponding parts in all thefigures.

A designates the outside casing of the pumpcylinder at, by which anannular space orjacket, B, is formed, surrounding the pump-cylinder onall sides. This jacket may be filled with cold or flowing water for thepurpose of aiding in the cooling of theinside cylinder, at, and

its follower U. r

The several parts of the injecting apparatus and their combination willreadily be understood by reference to Fig. 2 of the drawings.

The letter D in said figure represents a cylin- 6 drical barrel, thereduced end D of which is screw-threaded and screwed into acorresponding threaded bore or aperture in the wall of the cylinder. Atthe inner reduced end of the barrel is an annular flange, d, which formsa seat for the spraying-disk F, the latter being clamped against flanged by the forward end of a cylindrical plug, E, which is inserted intobarrel D, and is provided with acentral longitudinal bore or channel, 0.rear end is another channel,f, intersecting the former at right angles.These several parts are held together by a screw-cap, H, and the liquidto be injected into the cylinder is fed to the channelsfand 0 through abore, G, in bar- 8 rel D by means of suitable tubing, which is screwedtightly upon the threaded inlet G and suitably packed, if necessary.

In the modified arrangement shown in Fig.

3 two injectors, K and K, are used, which 8 are fed by branches I from acommon inlet, 1, which communicates with the liquid tank or reservoir.Where this construction is employed the injector-nozzles must not beplaced too close to the ends or heads of the cylinder,

nor yet so far from them as to allow of the injection through them ofliquid on the under side of the piston or follower.

The liquid tank or reservoir used in this connection with the injector,irrespective of the 5 detailed construction and arrangement of thelatter, is formed or constituted by the condenser of the machine towhich the apparatus is applied; and it follows that the injector,

during the operation of the machine, will con- At its extreme 75 tinueto inject spray or atomized liquid into the cylinder until equilibriumof pressure between the pump-cylinder and the condenser has beenestablished. The effect of the spray during the inflow of gas into thepump-cylinder is to supersaturate it, for the sprayingliquid or injectedliquid can only be vaporized by taking up heat, and thus reducing inexactly the same proportion the heat in the cylinder.

In this connection we desire it understood that we do not restrictourselves to the precise construction of the mechanism as shown, for itis obvious that this maybe changed or modified in its details without inany essential part deviating from the spirit of our invention.

We claim and desire to secure by Letters Patent of the United States- 1.The combination, with a cylinder of a gas or compressing pump forrefrigerating-machines or iceinachines, of a device or appara- -2 ceasestus for injecting atomized liquid into the body or gas-chamber of thecylinder, substantially as set forth.

2. The combination, with the cylinder of a gas or compression pump forrefrigerating-inachines or ice-machines, of an atomizing and injectingdevice connecting the body or gaschamber of the cylinder with theapparatus in which the gas is condensed or liquefied, and adapted toinject the liquefied vapor, in the form of fine spray, into thepump-cylinder, substantially as and for the purpose shown and set forth.

In testimony that we claim the foregoing as our own we have hereuntoaffixed our signatures in presence of two witnesses.

WILLIAM H. WOOD. GEORGE RIOHMON I).

Witnesses:

(J. F. Pos'r, JosEPH L. OONTRELL.

